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Basis Of Presentation Derivative Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Foreign Exchange Contract          
Derivative [Line Items]          
Notional amount of derivative instrument $ 30   $ 30   $ 29
Foreign Exchange Contract | Not Designated as Hedging Instrument [Member] | Operating Expense [Member]          
Derivative [Line Items]          
Loss Recognized on Derivatives 1 $ 0 1 $ 0  
Foreign Exchange Contract | Maximum          
Derivative [Line Items]          
Fair value of derivative instrument 1   1   2
Interest Rate Swap          
Derivative [Line Items]          
Notional amount of derivative instrument 1,475   1,475    
Interest Rate Swap | Not Designated as Hedging Instrument [Member] | Interest Expense [Member]          
Derivative [Line Items]          
Loss Recognized on Derivatives 5 $ 14 4 $ 45  
Interest Rate Swap | Not Designated as Hedging Instrument [Member] | Other Current and Non-Current Liabilities [Member]          
Derivative [Line Items]          
Fair value of interest rate swap contracts 28   28   $ 33
Interest Rate Swap | July 2012          
Derivative [Line Items]          
Notional amount of derivative instrument 225   225    
Interest Rate Swap | January 2013          
Derivative [Line Items]          
Notional amount of derivative instrument 200   200    
Interest Rate Swap | August 2015          
Derivative [Line Items]          
Notional amount of derivative instrument 600   600    
Interest Rate Swap | November 2017          
Derivative [Line Items]          
Notional amount of derivative instrument $ 450   $ 450